What's New in .NET 9 with Examples

Hello, everybody. I'm Nick, and in this video, I will show you every new feature added in .NET 9 that you should actually know about and use when you upgrade to this version.

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#csharp #dotnet

[jaywalks]

00:00:00 - Introduction to .NET 9: Overview of new features and their importance.
00:00:34 - Feature Switching: Explanation and implementation of Microsoft's built-in feature flags.
00:03:00 - LINQ Enhancements: New LINQ methods, including AggregateBy and CountBy.
00:07:00 - Spans and Memory Efficiency: Efficient use of ReadOnlySpan<T> and ReadOnlySet.
00:16:44 - Hybrid Caching System: Demonstration of combining memory and distributed caching.
00:22:10 - JSON Schema Exporting: Exporting schemas for external integration and OpenAPI updates.
00:24:14 - Sequential GUIDs: Introduction of version 7 GUIDs for database and distributed systems.

[liski]

The way Nick writes stuff in his project and when he opens them, just removes them without addressing them, or even smiling, makes me chuckle every time. "JASON!"

[honzajscz]

The variable Dic really got me laughing :-)

[MonkeyVaughan]

If I go to a different video after watching your thoughts it feels like my internet is broken or in slow motion. Very efficient learning. Much appreciated.

[jjxtra]

Stone cold face when referencing the holy numbers. Impressive.

[AlFasGD]

params was only legal with an array type, not even list, enumerable or the alike. So we also get that, and full support for spans, making the feature complete. Though I still reckon it useless now that we've got collection expressions, which were made for the sole purpose of making it more convenient to express a collection of elements.

[codewkarim]

07:17 Nick turns to a salesman for a couple of seconds, his tone, his character even his gesture changes x)

[rasimismatulin]

LIKE this who wait video about EF Core changes

[aweklin]

Hi Nick, thanks for sharing this.
Wondering if we can someday get a playlist on Span, because I want to learn it in-depth to master how and when to use it.
Thanks in anticipation.

[codewkarim]

Genuine question, why did you use the decimal.Add instead of just + the operands?

[OndrejMusicIsMine]

Personally I liked the backing field keyword addition the most.

[xaberue]

amazing summary in just 25min, thanks!

[theMagos]

We're doing decimal.Add() over + now?

[justinharris]

I wonder why they didn't add SumBy and AverageBy

[shinkathe]

Dude had a lil' Heavy Rain reference in there :D

[bjk]

Thank GOD for the discount code. I missed my chance the first time and flat out couldn’t afford it lol

[krccmsitp]

FYI, from the docs: "HybridCache is currently still in preview but will be fully released *after* .NET 9.0 in a future minor release of .NET Extensions."

[emfi]

In my experience, a feature flag requires quite often a new IoC container.
Feature disable => register null object
Feature enabled => register real object

That means that I have to perform a deployment, when I change the flag.

[gogreenwithhumanity]

As per microsoft, the Hybrid Cache will be released in minor release post 9.0 release

[Totti]

Great Video, please video for Blazor!